Yan Zhao at Lanzhou University and co-workers 1 have found an alternative climate indicator for lower areas - pollen trapped in lake sediments.

兰州大学赵艳及其合作者的研究工作证明在低海拔地区，湖泊沉积物中的孢粉可以作为很好的气候指示物。

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For scholars like Mr Yan and Mr Zhao, the pre-Qin thinkers offer fresh approaches to solving the problems of what Mr Zhao calls a "failed world", with its endless wars.

对于像阎和赵这样的学者来说，先秦思想家为解决赵称之为“失败的世界(其战争没有休止)”的问题提供了新方法。

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During the Warring states Period (5th century BC-221 BC), the states of Qi, Yan and Zhao all constructed extensive fortifications to defend their own borders.

战国期间(公元前5世纪- 221年)，齐、燕、赵修建大量城墙保卫其边境。

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